Method of producing complementary insole and outsole



Sept. 15, 1942. N, GR|F|=|N 2,295,650

METHOD OF rnonucme COMPLEMENTARY INSOLE AND QUTSOLE Filed NOV. 28, 1934 'IIIIIIIIII- '1 MMATToRA/Em Patented Sept. 15, 1942 1 k METHOD OFPRODUGING COMPLEMENTARY INSOLE AND OUTSOLE Norval B. Griffin, Portsmouth, Ohio, assignor, by

mesne assignments, to United Shoe Machinery Corporation, Borough of Flemington, N. J., a corporation of New Jersey Application November 28, 1934, Serial No. 755,181

5 Claims.

This invention relates to the production from an outsole blank of an outsole and an insole which are complementary.

In a production of a shoe with a light and flexible forepart or ball section, it has been proposed to make an insole of a single piece of material, of full length insole pattern outline with the medial portion of the forepart of the insole skived out to render it thin and flexible, and. bounded by a relatively staunch margin. A heavy or thick margin for the forepart and a shank and heel section or rear part of corresponding thickness to that of the marginal forepart, provides a sufficient thickness for channelling to forma continuous, upstanding lip on one side of the insole, extending from the heel breast line forwardly following the insole outline when it is desired to stitch the upper to the insole.

It has also been proposed to produce from an outsole blank an outsole and an insole which are complementary, the insole constituting a frame-like forepart and being cut out from an outer sole blank by longitudinally splitting the shank and heel portion of the blank and cutting a rand from the margin of the forepart of the blank. The rand may either remain attached. to the front end of the shank part, or the rand and shank portion may be cut in separate sections with the ends of the rand subsequently secured to the forward end of the shank portion or section.

The frame-like foreepart insoles present objections in the manufacture of the shoes and are primarily applicable to cement processes of manufacture. When using a frame-like forepart insole in a cement process, it is necessary to apply a temporary sheet upon the under side or bottom of the ball portion of the last to cover that portion, to prevent the cement from adhering to the last. While the sheet protects the last from the cement, any over-spreading of cement onto the sheet causes the sheet to adhere to the outer sole, making its removal diflicult and if not removed the sheet interferes with a satisfactory securing of the sock lining in the shoe. Furthermore, considerable care and skill is required properly to fit the frame-like forepart of the insole to the last so that it will be properly positioned during the lasting operation and this adds to the cost of making the shoe.

The present invention, likewise, relates to the production of a complementary and unitary insole and unitary outsole from a single blank or piece of leather material, with the forepart or ball section of the insole constituting a thin web having a thickened margin, the insole-outsole combination being produced without waste, and the insole being devoid of the objections of a rand or frame type insole.

An object of the invention is in the production of a complementary insole-outsole, split from a single outer sole blank or sole leather stock in a manner to provide a unitary insole having a forepart or ball section of thin web form with a staunch or relatively thicker margin, and. a unitary outsole having a forepart or ball section of a substantial thickness with a relatively thinner margin.

Another object of the invention is to provide an insole and outsole from a single piece of leather with a consequentsaving' in the cost of the material.

Another object of the invention is to provide a complementary insole and outsole with the outsole of a normal thickness at the forepart where the wear is the greatest, and a thin, flexible forepart insole having a margin of sufficient thickness to take care of the channelling of the insole and for the lasting and stitching operations. I

Various other features and advantages will be more fully apparent from a description of the accompanying drawing, in which:

Figure 1 is a plan view of a shoe sole blank, illustrating the forward or toe end portion as partially, longitudinally split, the toe portion of one of the sections being bent upwardly.

Figure 2 is a section on line 2-2, Figure 1.

Figure 3 is a plan view of the underside of the insole before channelling to form the upstanding lip.

Figure 4 is a plan view of the upper side of the outsole.

Figure 5 is a plan view of the completed insole, marginally channelled and the flaps produced by channelling bent up to form an in-seam lip.

Referring to the drawing, I indicates a leather sole blank having the flesh and grain sides indicated respectively at 2 and 3. The blank is split longitudinally, approximately medially of its thickness along a plane or division 4 for the rear part or heel and shank portions thereof, paralleling the flesh and grain sides of the blank, and to a point approximately at the juncture of the ball and shank sections of the blank. The split or division continues in the same plane marginally of the outline of the ball section and for an appropriate width of margin, from which it bevels upwardly or outwardly and correspondingly in and containing the grain side 3, provides a unitary outsole and in accordance with the particular manner of splitting, a raised or thickened medial portion 8 for the forepart or ball section of the outsole. The medial portion of the ball portion of the outsole is of anormal, thickness at the point where the wear is the greatest, and

therefore nothing is sacrificed from the standpoint of service.

The section 9, as the upper section in Figure 2,.

provides a unitary insole having its lower side complementary to the relative'upper side of the outer sole; furnishing a thin and flexible medial or web portion ID for the forepart, with a relatively thicker margin; The marginaledgeof-the entire insole is of uniform thickness and of a degree and for a margin width to permit-either single or double channelling for the formation of an upstanding lip II, the channelling forming continuous flaps, extending from the heel breast line forwardly for the outline of the blank, bent upwardly'to extend laterally from one side of the insole, and follows the well-known practice of forming an in-seam lip to which the upper is stitched, when the upper is to be connected to the insole by stitching.

Having described my invention, I claim:

1. The method of producing a unitary insole and unitary outsole from a leather, sole blank which consists in longitudinally dividing a leather sole blank into two sections by splittingthe heel and the shank portions and the margins of the ball portion of the blank in one plane parallel to the opposite surfaces of the blank, and splitting the ball portion within the margins thereof in a second plane parallel to the opposite surfaces of the blank and by making a merging cut joining said planes thereby producing when the sections are separated a unitary'outsole with a thickened ball portion within its marginsand a unitary insole having aball portion thinned within its margins.

2. The method ofproducing a unitary insole and unitary outsole from a leather sole blank, consisting in longitudinally splitting a leather sole blank into two sections, on a plane for the heel and shank portion and margins of the ball portion of the blank and beveling into a second offset plane for the ball portion of the blank within the margins, thereby producing when the sections are separated a unitary outsole with a thickened ball portion within its margins and a unitary insole having a ball portion thinned Within its margins.

3. The method of producing a unitary insole and unitary outsole from a leather sole blank, consisting in longitudinally splitting a leather sole blank into two sections on one plane for the heel and shank portion and margins of the ball portion of the blank and on a second plane for the ball portion of the blank, and forming a merging out joining said planes, thereby producing when the sections are separated a unitary outsole with a thickened ball portion within its margins and a unitary insole having a ball portion thinned within its margins.

4. That improvement in methods of making shoes which consists in splitting an insole and an outsole from a soleblank by a cut located substantially closer to one surface of the blank in its central forward portion than in its adjacent marginal portion, thereby forming an insole having a recess extending only part way through from its outer surface and. an outsole having in its central forward portion a projection complemental to said recess, forming a marginal sewing rib at the recessed side of the insole, securing an upper and a welt to said rib, laying the outsole with its forepart projection fitting with in and substantially filling the recess in the insole and permanently attaching the outsole to the shoe.

5. The method of producing an insole having a cavity in one side of the. central portion ofv the forepart thereof and a complementary outsole having a raised central portion for one side of the forepart, consisting in longitudinally dividing a leather sole blank into two sections by splitting the heel, shank andmargins of. the forepart on one plane and the central portion of the forepart in an ofiset relation to and joining with the plane dividing themarginsof the. forepart and shank portionsof the blank. v r

- NORVALB. GRIFFIN. 

